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A. Mean contrast threshold for orientation identification for the baseline steady fixation condition and for the conditions requiring saccades only (no counting or pointing). Thresholds (75% correct) were obtained from 14 psychometric functions (see Figs. 2, 3a, 3c and 8). B. Mean performance at 100% contrast for 5 conditions: baseline steady fixation, saccades only (no counting or pointing), counting during steady fixation, counting with saccades, and pointing.
